Corrugated boiler furnace or flue.



No. 689,688. Pate nted Dec. 24, 1981. J; uonmzn. CORRUGATED BOILERFURNACE 0R FLUE.

' (Application filed Kay 24, 1901.)

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WITNESSES IN VENTOH UNITED STATES PATENT OFFICE.

JOSEPH NODDER, OF SHEFFIELD, ENGLAND, ASSIGNOR TO JOHN BROWN ANDCOMPANY, LIMITED, OF SHEFFIELD, ENGLAND.

GOR RUGATED BOILER FURNACE OR FLUE.

SPECIFIGATION forming part of Letters Patent N 0. 689,688, datedDecember 24, 1901.

Application filed May 24,1901. Serial No. 61,785a (No model.)

To all whom it may concern-. by forming them into the required cylin Beit known that I, JOSEPH NODDER, forge drical bodies the parts of largerdiameter are manager, a subject of the King of Great Britthicker thanthe parts of smaller diameter, the ain and Ireland,1'esiding at AtlasWrks,Shefthickness gradually, increasing from the parts 5 field, in thecounty of York, England, have at B to the'tops of the corrugations at A,

invented certain new and useful Improvewhereby the strengthis-madeproperly proments in Corrugated BoilerFurnacesorFlues; portionalto the working pressure throughout, and I do hereby declare thefollowing to be a and injurious local expansion and contraction full,clear, and exact description of the in during work are avoided.

i0 vention, such as will enable others skilled in Having nowparticularly described and asthe art to which it appertains to make andus certained the nature of this invention and in the same. What mannerthe same is to be performed, I

Although in corrugated boiler furnaces and declare that what I claim isfiues the parts of larger diameter should be 1. The herein-describedmethod of manu- 15 proportionately thicker than the parts of facturingcorrugated boiler furnaces or flues,

smaller diameter in order to be capable of consisting of rolling a flatplate with corruwithstanding equally well the Working presgations ofgreat thickness and alternating sure in such furnaces and flues ashitherto flat portions of less thickness, such thickness made byexpanding the corrugations from a gradually decreasing from thecorrugations 2o plain cylinder, they are thinner at their parts to thefiat portions and then forming the plate of larger diameter than theyare at their parts so rolled into a cylindrical boiler-flue with the ofsmaller diameter. fiat portions parallel with the axis of the fine,

The object of this invention is to overcome substantially as described.this defect. 2. As a new article of manufacture, the 25 In theaccompanying drawings, Figure 1herein=describedcylindricalcorrugatedboiler represents, in longitudinalsection, a part of furnaces or lines, consisting of a plate having aplate for aboiler furnace or flue in accordcorrugations and flatportions, parallel with ance with this invention. Fig. 2 is a longi theaxis of the flue alternating with the tudinal section, on a smallerscale, of part of corrugations, the parts of largest diameter 30 atubelength made from my improved plate. being of the greatest thickness andthe parts 76 Fig. 3 is a cross-section on the line 3 3, Fig. 2. ofsmallest diameter being of the least thick- The aforesaid defect isovercome accordness, the thickness gradually increasing from ing to thisinvention by rolling a fiat plate the parts of smallest diameter tothose of with alternate corrugations Aand flat or aplargest diameter,substantially as described.

35 proximately fiat and thinner parts B, which In testimony whereof Iaffix my signature in the finished flue are parallel with its axis, inpresence of two Witnesses.

as shown in the drawings,the thickness gradu- JOSEPH NODDERP allyincreasing from the parts at B to the tops Witnesses: of thecorrugations at A, so that in the fin- HAROLD P. BUBDEKIN,

4o ished furnaces or flues made from such plates BENJN. CHEETHAM.

